Like the first battle against Barbatos, the screen will fade black when you have defeated her.
I would recommend to have three people at the back and one Tank. Having two or more Tanks is a waste of time and Elraine escapes physical combos.
Kyle is the best Tank for this battle, since Loni (who has more HP) is the only one who has access to heal at this moment. After this battle, Reala will come back.
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